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Q&A Session for "Callimachus: Semantic Web Apps Made Easy"

Q: Was Callimachus arguing against a "single inheritance" hierarchy or arguing against a universal "Thing" which is the superclass of all things?

A: Callimachus, the Greek poet, could easily justify placing many of his scrolls (of short poems) in multiple bins. He argued that some things have multiple categories (or types) and could not be arranged in single hierarchy.

The Following Questions were generated during the original webcast on April 1, 2009

Q: How easy is it to debug an application?

A: (Dean Allemang) As a user of this system (not its designer) I can respond to this from experience. It is surprisingly simple. Unlike Rete-based rule engines (for example), rule firing uses a very simple execution model.

Q: Do you do constraint checking before updating the data like in relational DB? How is the performance if data is frequently updated?

Thanks to everyone who attended the SPARQL By Example Web cast or who has watched the archived recording of it. There was a tremendous level of enthusiasm during the one hour presentation, and as a result we did not have the chance to answer all of the excellent questions that participants submitted. Below, I’ve tried to summarize most of the unanswered (and some of the answered) questioons and provided some explanations and pointers to further information.